/Engine/Source/Editor/Kismet/Public/Debugging/SKismetDebugTreeView.h
Gather all of the children.
virtual void GatherChildrenBase ( [TArray](API\Runtime\Core\Containers\TArray)< FDebugTreeItemPtr > & OutChildren, const [FString](API\Runtime\Core\Containers\FString) & InSearchString, bool bRespectSearch )